<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
		<style>
			form{
				width: 500px;
				height: 60px;
				margin: 50px auto;
				border: 1px solid;
				display: flex;
			}
			form input:nth-child(1){
				flex:1;
			}
			form input:nth-child(2){
				height: 100%;
				width: 200px;
			}
		</style>
	</head>
	<body>
		<form>
			<input type="text"/>
			<input type="button" value="登录"/>
		</form>
	</body>
</html>
